ABCD

Example

A
A
A
_
C
B
C
18
B
B
C
_
16
19
13
 
 
A
B
C
_
_
_

Solution

A
A
A
9
C
B
C
18
B
B
C
21
16
19
13
 
 
A
B
C
3
8
5
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ABCD
ABCD

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